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The empirical relation between solar radiation and hours of sunshine
Author(s) -
Glover J.,
McCulloch J. S. G.
Publication year - 1958
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49708436011
Subject(s) - sunshine duration , latitude , angstrom , atmospheric sciences , range (aeronautics) , environmental science , low latitude , function (biology) , radiation , mathematics , meteorology , physics , optics , materials science , chemistry , relative humidity , astronomy , evolutionary biology , composite material , biology , crystallography
The variation with latitude of the regression parameters a and b in the conventional equation of Ångström type\documentclass{article}\pagestyle{empty}\begin{document}$$ Q/Q_A = a + b\,n/N $$\end{document}between total solar radiation on a horizontal surface ( Q ) and hours of bright sunshine ( n ) has been examined. It has been shown that the slope of the relationship b is effectively constant, while the threshold value a is a function of latitude. An empirical relationship leading to the Ångström equation at each latitude ϕ over the range 0° ‐ 60° is derived and is shown to give values in reasonable accord with previous experience. It is\documentclass{article}\pagestyle{empty}\begin{document}$$ Q/Q_A = 2.09\,\cos \phi + 0.52\,\,n/N $$\end{document}